Here's a thread about it from the Harvest forum.

Here is a link that might be useful: Harvest Forum

I checked out that thread before posting my question but it didn't help with a canning recipe, and while it may seem silly to actually preserve cocktail sauce when it is so easy to make up fresh, I am hoping to give it as christmas gifts, a bit more interesting than ketchup ... but thanks!

Make whatever recipe for catsup you use. Add some lemon juice to taste...I use about 2 T. per cup of the catsup, and some horseradish. The amount depends on how hot you like your sauce and how hot your horseradish is. I would add grated root directly to the mix.
Taste and see if it needs to be hotter...if so add red pepper flakes to taste....and can like catsup.
Linda C